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Psoriasis

Psoriasis is thought to be an immune system problem. It develops when a person's immune system sends faulty signals that tell skin cells to grow too quickly. New skin cells form in days rather than weeks. Triggers include infections, stress, and cold. The most common symptom is a rash on the skin, but sometimes the rash involves the nails or joints. Treatment aims to remove scales and stop skin cells from growing so quickly. Topical ointments, light therapy, and medications can offer relief.